package org.jeecg.common.util;

import javax.servlet.http.HttpServletRequest;
import org.jeecg.common.constant.ServiceNameConstants;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

@Component
public class SpringContextUtils implements ApplicationContextAware {

  /** 上下文对象实例 */
  private static ApplicationContext applicationContext;

  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    SpringContextUtils.applicationContext = applicationContext;
  }

  /**
   * 获取applicationContext
   *
   * @return
   */
  public static ApplicationContext getApplicationContext() {
    return applicationContext;
  }

  /** 获取HttpServletRequest */
  public static HttpServletRequest getHttpServletRequest() {
    return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
  }

  /** 获取项目根路径 basePath */
  public static String getDomain() {
    HttpServletRequest request = getHttpServletRequest();
    StringBuffer url = request.getRequestURL();
    // 微服务情况下，获取gateway的basePath
    String basePath = request.getHeader(ServiceNameConstants.X_GATEWAY_BASE_PATH);
    if (oConvertUtils.isNotEmpty(basePath)) {
      return basePath;
    } else {
      return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString();
    }
  }

  public static String getOrigin() {
    HttpServletRequest request = getHttpServletRequest();
    return request.getHeader("Origin");
  }

  /**
   * 通过name获取 Bean.
   *
   * @param name
   * @return
   */
  public static Object getBean(String name) {
    return getApplicationContext().getBean(name);
  }

  /**
   * 通过class获取Bean.
   *
   * @param clazz
   * @param       <T>
   * @return
   */
  public static <T> T getBean(Class<T> clazz) {
    return getApplicationContext().getBean(clazz);
  }

  /**
   * 通过name,以及Clazz返回指定的Bean
   *
   * @param name
   * @param clazz
   * @param       <T>
   * @return
   */
  public static <T> T getBean(String name, Class<T> clazz) {
    return getApplicationContext().getBean(name, clazz);
  }
}
